Using LanguageⅡ第二课时教学实录

Book8 Unit 2 Using language教学设计

The return of the dinosaurs? I. Teaching goals Enable the students to express their opinions about cloning using some useful expressions.

II. Teaching important points

Learn to use the structures of expressing and supporting an opinion. III. Teaching difficult points : How to give a speech. IV. Teaching methods: Cooperative learning. V. Teaching aids: A computer & a projector. VI. Teaching procedures & ways

Step Ⅰ Lead-in 1.T: Good morning , boys and girls! Last class we have talked about clone, we all know it is not a dream. Now everyone, if I give you a chance to clone what will you

restore then? S: Edison, dinosaurs, Japanese wolf, Einstein. T: All your choices are excellent. Today we will learn another passage about cloning,

from which we will know whether we can bring dinosaurs back to life. Ask the students to look at the screen. Present some pictures of dinosaurs. 2.Ask Ss to look at the following pictures and think which film they are from. 3. Ask Ss the following questions: 1) Have you ever seen the film Jurassic Park? Why do people like this film?

What animals do you see in the film? Are they real?

2) Do you like dinosaurs? Can you see them in our real life? Why? 3 )Do you think it is possible to clone dinosaurs? If not, why? If yes, do you

think that’s good for human beings? Why?

Step Ⅱ Skimming Arrange according to time. 5. research using the embryos of mice 4. first experimental clones of cows 8. first experimental clones of mice 7. work on the embryos of sheep and mice 2. China’s first cloned twin calves

3. cloning of frogs

6. first clone of a mammal 1. cow gave birth to a bison ( 3 5 7 8 4 6 1 2 )

Step Ⅲ

Careful reading. Task 1:True or False

1）Scientists are still experimenting with cloning mammals because they think it can make money. 2）The animals that have disappeared from the earth, like dinosaurs, can be brought back to life through cloning. 3）If we can clone any extinct animals, we should let them live in a zoo.

Task 2:Choose the best answer.

1.The writer of the text _____.

A. is excited by the possibility of cloning fierce and extinct animals

B. believes that extinct animals can be brought back to life by cloning

C. thinks it impossible or unsuitable to clone extinct animals like dinosaurs

D. dreams of dinosaurs returning to the earth

2. The film Jurassic Park is popular because _______ .

A. people are interested in the subject of cloning

B. all the actors are dinosaurs

C. it was directed by a scientist who clones dinosaurs

D. it proves very interesting 3. Which of the following is true?

A. Mice were cloned in 1981.

B. Dolly the sheep was the first cloned animal.

C. The name of the cloned cow is “Bison”.

D. China was successful in cloning mammals.

4. The reasons why a group of cloned animals all die of the same illness do NOT include ____.

A. they have the same arrangement of genes

B. there isn’t enough diversity in the group for it to overcome illnesses

C. the illness is a new one

D. their arrangement of genes can not resist that new disease 5. We can infer from the text that ____.

A. scientists are experimenting to clone dinosaurs

B. dinosaurs will never return to the earth

C. cloned animals will only live in the zoo

D. the DNA of dinosaurs can only survive 10 000 years

Task3:

Read the text and answer the questions. 1.Why shouldn’t you clone an extinct animal unless there is enough diversity in the

group?

There will not be enough genetic variation in the group to be able to resist new illnesses. 2.Why is it wrong to clone an extinct animal if it would live in a zoo? It is not a good idea to clone an animal that would live in a zoo because it is not a suitable habitat to develop and increase its numbers.The zoo is not a natural environment for a wild animal.

3.Why can’t you clone the DNA of animals that have been extinct longer than 10,000

years? The DNA of animals more than 10,000 years old is not suitable for cloning, for it can’t survive so long.

Task 4：Give some reasons why it is either impossible or unsuitable to clone extinct animals. Reason 1:You need perfect DNA. Reason 2:There is not enough diversity for cloned animals to overcome new

diseases. Reason

3:It would be unfair to clone any extinct animals if they would have

to live in a zoo.

Step Ⅳ

Vocabulary (synonyms) 1.

It proves how the idea struck a mixture of fear and excitement into people’s heart . A.

have on the brain

B. confused C. proved people crazy

D. scared 2.

From time to time

people suggest that extinct animal…

A. Long time ago

B. Sometimes C. All the time

D. Each time 3.

People suggest that dinosaurs can possibly be brought back to life.

A.

make a life

B. earn one’s living C. live on

D. make the dead alive

4.

The initial requirement is that you need perfect DNA. A.

most thankful

B. final C. most difficult

D. original

5.

All efforts of cloning an animal will be in vain if there is not enough diversity. A.

careless

B. useless C. helpless

D. homeless

6.

Others will pass on the ability to resist that disease. A.

fight against

B. infect

C. hire

D. indicate 7.

The chance of dinosaurs ever returning to the earth is merely a dream . A. actually

B. only

C. nearly

D. finally

Step ⅤHomework Ask the students to t write down your feelings and attitudes towards clone.